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A six-rhabdomere, open rhabdom arrangement in the eye of the chrysanthemum beetle Phytoecia rufiventris: some ecophysiological predictions based on eye anatomy Biocell
Meyer-Rochow,Victor Benno; Mishra,Monalisa.
We are describing a rhabdom organization of the eye of the chrysanthemum beetle Phytoecia rufiventris that to date has not been described from any other insect. In cerambycid beetles free rhabdomeres, forming a circular, open rhabdom, surround a central rhabdom made up of the rhabdomeres of one or two cells. In Phytoecia rufiventris the central rhabdomeres are missing throughout the eye and the microvilli of the outer 6 rhabdomeres are regularly oriented in three directions. Following the classification of rhabdom types suggested by Wachmann (1979), we suggest to name the rhabdom arrangement seen in the retina of Phytoecia rufiventris "Grundmuster 3". This pattern ought to facilitate polarization sensitivity and movement perception, features that agree...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compound eye; Retina; Vision; Polarization sensitivity.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452009000200006
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Apoptosis Durante el Desarrollo Embrionario de la Retina de Tortuga (Trachemys scripta elegans) International Journal of Morphology
Segovia,Y.
La apoptosis o muerte celular programada es un proceso que ocurre durante el desarrollo del sistema nervioso. El objetivo de este estudio fue observar los patrones de apoptosis que se producen durante el desarrollo embrionario de la retina, desde el estadio S16 al momento del nacimiento, mediante miscoscopía óptica y electrónica. Se utilizaron retinas de embriones de tortuga. Nuestros datos muestran que los primeros signos de apoptosis comienzan en el estadio S16, en la capa nuclear interna y alcanzan su máxima densidad tanto en la capa nuclear interna como en la capa de células ganglionares en S20, para extinguirse, prácticamente, en el momento del nacimiento. Por otra parte, la apoptosis sigue un gradiente centro-periferia.
Tipo: Journal article Palavras-chave: Trachemys scripta elegans; Apoptosis; Retina; Tortuga.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100020
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Atrofia progressiva generalizada da retina em cães da raça Cocker Spaniel Ciência Rural
Gomes,Débora; Otsuki,Denise Aya; Lisak,Ricardo; Safatle,Angélica de Mendonça Vaz.
Atrofia progressiva generalizada da retina (APGR) é uma doença frequente nos cães da raça Cocker Spaniel, caracterizada pela perda progressiva da função retiniana externa e desaparecimento dos fotorreceptores. A doença é bilateral, hereditária, autossômica recessiva, sem predisposição sexual e está frequentemente associada à catarata. Segundo estudos moleculares, a degeneração ocorre por mutação de diversos genes. Nos cães da raça Cocker Spaniel Americano, a doença é observada entre três e cinco anos de idade e, no Cocker Spaniel Inglês, entre quatro e oito anos de idade. Os sinais clínicos mais encontrados são: nictalopia, hiperreflexia tapetal e catarata. O diagnóstico baseia-se no histórico clínico, exame oftalmológico e em exames complementares, como...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Retina; Cocker Spaniel; Catarata; Degeneração retiniana.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000800011
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Avaliação da produção lacrimal, pressão intraocular, retinografia e biometria ocular em bovinos das raças Nelore e Gir hígidos Arq. Bras. Med. Vet. Zootec.
Morais,T.L.; Neves,C.A.; Borges,N.C; Lima,A.M.V; Silva,L.F.L; Castro,L.T.S; Espindola,S.O; Cunha,P.H.J.
RESUMO No presente estudo, foram avaliados parâmetros oftalmológicos de 38 bovinos das raças Nelore (n= 19; grupo GN) e Gir (n= 19; grupo GG), machos, com idade média de 15 meses. Os exames oftalmológicos realizados foram teste lacrimal de Schirmer 1 (TLS-1), tonometria de aplanação, retinografia e biometria por ultrassonografia em modo B. Os resultados do TLS-1, tonometria de aplanação e biometria ocular foram avaliados por meio da análise de variância (ANOVA), e as médias comparadas pelo teste de Tukey. Para o exame de retinografia, foi realizada a análise descritiva das estruturas anatômicas. O TLS-1 e a tonometria não diferiram (P≥0,05) nas comparações entre os olhos e entre os grupos raciais. A retinografia permitiu a visualização do disco óptico, dos...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oftalmologia; Retina; Schirmer; Tonometria; Ultrassonografia.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000100177
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Can the fractal dimension be applied for the early diagnosis of non-proliferative diabetic retinopathy? BJMBR
Kunicki,A.C.B.; Oliveira,A.J.; Mendonça,M.B.M.; Barbosa,C.T.F.; Nogueira,R.A..
The fractal dimension has been employed as a useful parameter in the diagnosis of retinal disease. Avakian et al. (Curr Eye Res 2002; 24: 274-280), comparing the vascular pattern of normal patients with mild to moderate non-proliferative diabetic retinopathy (NPDR), found a significant difference between them only in the macular region. This significant difference in the box-counting fractal dimension of the macular region between normal and mild NPDR patients has been proposed as a method of precocious diagnosis of NPDR. The aim of the present study was to determine if fractal dimensions can really be used as a parameter for the early diagnosis of NPDR. Box-counting and information fractal dimensions were used to parameterize the vascular pattern of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Box-counting; Fractal dimension; Information fractal dimension; Retina; Vascularization; Non-proliferative diabetic retinopathy.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001000009
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Características Morfológicas de la Retina del Calderón Común (Globicephala melas; Traill, 1809) y su Relación con el Hábitat International Journal of Morphology
Mengual,R; Segovia,Y; García,M.
Existe una estrecha relación entre las características morfológicas de los sistemas sensoriales, su funcionamiento y el hábitat al que están adaptados los organismos. En este sentido, de todos los mamíferos marinos estudiados, los cetáceos son los que más profundamente han modificado su estructura y fisiología ocular por su estrecha adaptación a una vida exclusivamente acuática. Para aportar más datos a la literatura, el objetivo de este trabajo es describir morfológicamente la retina de la ballena piloto a través de técnicas de microscopia óptica, con el fin de relacionarla con su adaptación al medio acuático. Nuestros datos muestran que la retina de Globicephala melas se organiza de acuerdo al mismo plan básico de los vertebrados. Tiene un grosor medio...
Tipo: Journal article Palavras-chave: Globicephala melas; Visión de cetáceos; Retina.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400044
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Caspase dependence of the death of neonatal retinal ganglion cells induced by axon damage and induction of autophagy as a survival mechanism BJMBR
Sternberg,C.; Benchimol,M.; Linden,R..
We examined the degeneration of post-mitotic ganglion cells in ex-vivo neonatal retinal explants following axon damage. Ultrastructural features of both apoptosis and autophagy were detected. Degenerating cells reacted with antibodies specific for activated caspase-3 or -9, consistent with the presence of caspase activity. Furthermore, peptidic inhibitors of caspase-9, -6 or -3 prevented cell death (100 µM Ac-LEDH-CHO, 50 µM Ac-VEID-CHO and 10 µM Z-DEVD-fmk, respectively). Interestingly, inhibition of autophagy by 7-10 mM 3-methyl-adenine increased the rate of cell death. Immunohistochemistry data, caspase activation and caspase inhibition data suggest that axotomy of neonatal retinal ganglion cells triggers the intrinsic apoptotic pathway, which, in turn,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apoptosis; Autophagy; Caspases; Retina; Central nervous system.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001000005
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Cloning and retinal expression of melatonin receptors in the European sea bass, Dicentrarchus labrax ArchiMer
Sauzet, S; Besseau, L; Perez, P; Coves, Denis; Chatain, Beatrice; Peyric, E; Boeuf, G; Munoz Cueto, J; Falcon, J.
Melatonin contributes to synchronizing behaviors and physiological functions to daily and seasonal rhythm in fish. However, no coherent vision emerges because the effects vary with the species, sex, moment of the year or sexual cycle. And, scarce information is available concerning the melatonin age, receptors, which is crucial to our understanding of the role melatonin plays. We report here the full length cloning of three different melatonin receptor subtypes in the sea bass Dicentrarchus labrax, belonging, respectively, to the MT1, MT2 and Mellc subtypes. MT1, the most abundantly expressed, was detected in the central nervous system, retina, and gills. MT2 was detected in the pituitary gland, blood cells and, to a lesser extend, in the optic tectum,...
Tipo: Text Palavras-chave: Retina; Melatonin receptors; Sea bass.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4513.pdf
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COMPARACIÓN HISTOLÓGICA Y MORFOMÉTRICA ENTRE EL OJO DE Eremophilus mutisii (TRICHOMYCTERIDAE) Y EL DE Oncorhynchus mykiss (SALMONIDAE) Acta biol.Colomb.
TOVAR BOHÓRQUEZ,MARIO OSWALDO; CONTRERAS BRAVO,LUISA FERNANDA; CALDAS,MARIA LEONOR; RODRÍGUEZ CAICEDO,DANIEL; HURTADO GIRALDO,HERNÁN.
La visión es de importancia variable dependiendo de la relación de los peces con su hábitat, siendo clave en algunas especies y secundaria en otras. El objetivo de este estudio fue realizar una comparación entre el ojo de capitán de la sabana y trucha arco iris. La primera, nativa del altiplano cundiboyacence. La segunda es una especie introducida al país y con alta importancia en la piscicultura. Se obtuvieron cortes de ojo a 5 µm de espesor en ambas especies. Las dos presentan la estructura ocular típica de teleósteos conformada por una retina con ocho capas y dos membranas, células fotorreceptoras (conos y bastones), así como los otros tipos de células neuronales características (bipolares, horizontales, amacrinas y ganglionares), y un...
Tipo: Journal article Palavras-chave: Ojo; Retina; Morfometría; Trucha arco iris; Capitán de la sabana.
Ano: 2008 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2008000200005
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Conditioned medium from activated spleen cells supports the survival of rat retinal cells in vitro BJMBR
Sholl-Franco,A.; Araujo,E.G..
Cytokines are a heterogeneous group of molecules that have been associated with several functions in the nervous system, such as survival and differentiation of neuronal and glial cells. In the present study, we demonstrated that conditioned medium from spleen cells activated with concanavalin A increased neuritogenesis and survival of retinal cells, as measured by biochemical and morphological criteria. Our data showed that conditioned medium induced a five-fold increase in the amount of protein after 120 h in vitro. This effect was not inhibited by the blockade of voltage-dependent L-type calcium channels with 5.0 µM nifedipine. However, the use of an intracellular calcium chelator (15.0 µM BAPTA-AM) inhibited this effect. Our results support the idea...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytokines; Growth factor; Neuroimmunology; Retina; Development.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001100006
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EFECTO DE UN QUELANTE DE ZINC EXTRACELULAR SOBRE EL NÚMERO DE CÉLULAS GANGLIONARES EN RETINA DE RATA, Y TRANSPORTADORES DE TAURINA Y DE ZINC EN ESTAS CÉLULAS Acta biol.Colomb.
MÁRQUEZ GARCÍA,Asarí; SALAZAR,Víctor; LIMA,Lucimey.
RESUMEN La deficiencia de zinc en humanos produce disminución de antioxidantes, asociados a taurina, en la retina y se relaciona con adaptación anormal a la oscuridad, cataratas, ceguera y degeneración macular. Existe escasa evidencia acerca del efecto del zinc sobre el sistema de taurina en retina de mamíferos, por lo cual estudiamos el efecto del zinc sobre el transportador de taurina (TAUT) y los transportadores de zinc (ZnT-1 y 3) usando el quelante de zinc extracelular, ácido dietileno-triamino-penta-acético (DTPA), mediante inmunocitoquímica e inmunohistoquímica fluorescentes en células ganglionares (CG) y en las capas de la retina de ratas. Tres días después de la administración de DTPA (10μM) se utilizaron anticuerpos primarios y...
Tipo: Journal article Palavras-chave: Retina; Taurina; Transportador de taurina; Transportadores de zinc; Zinc.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2017000200002
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Effects of mercury intoxication on the response of horizontal cells of the retina of thraira fish (Hoplias malabaricus) BJMBR
Tanan,C.L.; Ventura,D.F.; de Souza,J.M.; Grotzner,S.R.; Mela,M.; Gouveia Jr.,A.; Oliveira-Ribeiro,C.A..
Methyl mercury (MeHg) is highly neurotoxic, affecting visual function in addition to other central nervous system functions. The effect of mercury intoxication on the amplitude of horizontal cell responses to light was studied in the retina of the fish Hoplias malabaricus. Intracellular responses were recorded from horizontal cells of fish previously intoxicated with MeHg by intraperitoneal injection (IP group) or by trophic exposure (T group). Only one retina per fish was used. The doses of MeHg chloride administered to the IP group were 0.01, 0.05, 0.1, 1.0, 2.0, and 6.0 mg/kg. The amplitudes of the horizontal cell responses were lower than control in individuals exposed to 0.01 (N = 4 retinas), 0.05 (N = 2 retinas) and 0.1 mg/kg (N = 1 retina), whereas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Methyl mercury; Horizontal cells; Electrophysiology; Hoplias malabaricus; Retina.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000700017
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Effects of Monocular Deprivation on the Dendritic Features of Retinal Ganglion Cells International Journal of Morphology
Mwachaka,Philip; Saidi,Hassan; Odula,Paul; Mandela,Pamela.
Monocular deprivation results in anatomical changes in the visual cortex in favor of the non-deprived eye. Although the retina forms part of the visual pathway, there is scarcity of data on the effect of monocular deprivation on its structure. The objective of this study was to describe the effects of monocular deprivation on the retinal ganglion cell dendritic features. The study design was quasi-experimental. 30 rabbits (18 experimental, 12 controls) were examined. Monocular deprivation was achieved through unilateral lid suture in the experimental animals. The rabbits were observed for three weeks. Each week, 6 experimental and 3 control animals were euthanized, their retina harvested and processed for light microscopy. Photomicrographs of the retina...
Tipo: Journal article Palavras-chave: Monocular deprivation; Retina; Retinal Ganglion Cells; Dendritic features; Eye.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400004
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Effects of Potentilla fulgens on the Changes Made in the Retinal Damage Induced by Traumatic Head Injury International Journal of Morphology
Hüseyin,Özevren; Engin,Deveci.
Traumatic head injury is a leading cause of mortality and morbidity. As a result of head trauma occurring in the retina of the various biochemical, histological and immunohistochemical effects were investigated. Sprague­Dawley rats were subjected to traumatic brain injury with a weight-drop device using 300 g-1 m weight­height impact. Twenty one rats were divided into three groups, as group 1 (vehicle-treated control), group 2 (vehicle-treated trauma) group 3 trauma + Potentilla fulgens ( P. Fulgens) 400 mg/kg/day, i.p.). Distilled water was used as vehicle. All rats were decapitated 5 days after the induction of trauma, and the protective effects of P. Fulgens were evaluated by histological, immunohistochemical and biochemical analyses. Although further...
Tipo: Journal article Palavras-chave: Traumatic injury; Retina; Potentilla fulgens; Rat.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300007
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Effects of sciatic-conditioned medium on neonatal rat retinal cells in vitro BJMBR
Torres,P.M.M.; Guilarducci,C.V.V.; Araujo,E.G..
Schwann cells produce and release trophic factors that induce the regeneration and survival of neurons following lesions in the peripheral nerves. In the present study we examined the in vitro ability of developing rat retinal cells to respond to factors released from fragments of sciatic nerve. Treatment of neonatal rat retinal cells with sciatic-conditioned medium (SCM) for 48 h induced an increase of 92.5 ± 8.8% (N = 7 for each group) in the amount of total protein. SCM increased cell adhesion, neuronal survival and glial cell proliferation as evaluated by morphological criteria. This effect was completely blocked by 2.5 µM chelerythrine chloride, an inhibitor of protein kinase C (PKC). These data indicate that PKC activation is involved in the effect...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Cytokines; Neurotrophic factors; Retina; Schwann cells; Sciatic nerve.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100012
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Electroretinography in dogs using a fiber electrode prototype BJMBR
Pereira,A.L.; Montiani-Ferreira,F.; Santos,V.R.; Salomão,S.R.; Souza,C.; Berezovsky,A..
We compared two electroretinography (ERG) electrodes in dogs using ERG standards of the International Society for Clinical Electrophysiology of Vision (ISCEV). Ten healthy Yorkshire terrier dogs (mean age, 2.80 ± 1.42 years; 6 females) weighing 5.20 ± 1.56 kg were evaluated using an ERG system for veterinary use. Dark- and light-adapted ERG responses were recorded using an ERG-Jet electrode and a fiber electrode prototype. The examinations were performed during 2 visits, 3 weeks apart. Both electrodes (ERG-Jet or fiber prototype) were used on each animal and the first eye to be recorded (OD × OS) was selected randomly. Three weeks later the examination was repeated on the same animal switching the type of electrode to be used that day and the first eye to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Electroretinography; Electrode; Retina; Canine; Prototype.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000300257
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Electroretinography in eight species of neotropical deer Arq. Bras. Med. Vet. Zootec.
Crivelaro,R.M.; Thiesen,R.; Aldrovani,M.; Lima,T.B.; Ortêncio,K.P.; Padua,I.R.M.; Duarte,J.M.B.; Laus,J.L..
ABSTRACT The aim of this study was to establish normal baseline ERG values of 23 anesthetized deer belonging to 8 neotropical species (Mazama americana, Mazama nemorivaga, Mazama gouazoubira, Mazama nana, Mazama bororo, Ozotocerus bezoarticus, Odocoileus virginianus and Blastocerus dichotomus). Only right eyes were studied. Chemical restraint was performed using xylazine associated with ketamine, IM, for M. americana, M. gouazoubira, M. nemorivaga, M. nana, M. bororo, O. bezoarticus and O. virginianus. A combination of tiletamine/zolazepam diluted in xylazine 2% was used for B. dichotomus individuals. After 20min of dark adaptation, electroretinograms were obtained using a handheld electroretinography (ERG) machine using the QuickRetCheck Protocol at three...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cervidae; Habitat; Retina; Wild animal; ERG.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000501505
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Estudio Morfológico de la Retina de Salmones (Salmo salar) International Journal of Morphology
Pellón,Mario; Rojas,Mariana; Yaikin,Pabla; del Sol,Mariano.
La retina de peces teleósteos como pez cebra, se ha transformado en un importante modelo para el estudio de la plasticidad neuronal y la neurogénesis. Se ha demostrado además que la retina experimenta cambios ontogenéticos para adaptarse a distintos medios ambientes durante su vida. Este estudio tiene como objetivo describir el desarrollo ontogenético de la retina del alevín de salmón desde la eclosión hasta la fase de juvenil. Se trabajó con 30 salmones divididos en tres grupos de 10. Grupo I: recién eclosionados, con saco vitelino y 18 mm de longitud. Grupo II: sin saco vitelino y 30 mm de longitud. Grupo III: 100 mm de longitud. Cinco alevinesde cada grupo fueron procesados según el protocolo de Hanken & Wassersug para medir los diámetros...
Tipo: Journal article Palavras-chave: Retina; Ojo; Alevín; Peces teleósteos; Salmón; Desarrollo.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200058
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Evidence of muscarinic acetylcholine receptors in the retinal centrifugal system of the chick BJMBR
Calaza,K.C.; Gardino,P.F..
In this study we characterize the presence of muscarinic acetylcholine receptors (mAChR) in the isthmo-optic nucleus (ION) of chicks by immunohistochemistry with the M35 antibody. Some M35-immunoreactive fibers were observed emerging from the retinal optic nerve insertion, suggesting that they could be centrifugal fibers. Indeed, intraocular injections of cholera toxin B (CTb), a retrograde tracer, and double-labeling with M35 and CTb in the ION confirmed this hypothesis. The presence of M35-immunoreactive cells and the possible mAChR expression in ION and ectopic neuron cells in the chick brain strongly suggest the existence of such a cholinergic system in this nucleus and that acetylcholine release from amacrine cells may mediate interactions between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Muscarinic receptors; Retina; Isthmo-optic nucleus; Centrifugal fibers; Acetylcholine; Chick.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000900014
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Evolution of circadian organization in vertebrates BJMBR
Circadian organization means the way in which the entire circadian system above the cellular level is put together physically and the principles and rules that determine the interactions among its component parts which produce overt rhythms of physiology and behavior. Understanding this organization and its evolution is of practical importance as well as of basic interest. The first major problem that we face is the difficulty of making sense of the apparently great diversity that we observe in circadian organization of diverse vertebrates. Some of this diversity falls neatly into place along phylogenetic lines leading to firm generalizations: i) in all vertebrates there is a "circadian axis" consisting of the retinas, the pineal gland and the...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Circadian rhythms; Evolution; Vertebrates; Pineal; SCN; Retina; Melatonin.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000300003
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